ZOOLOGY AND BOTANY, MICKOSCOPY, ETC. 503 



Californian Green Algae.*— D. H. Campbell points out that two 

 species of green alga?, Spondylomorum quaternarium Ehren. and Pitho- 

 phora 'CEdogon in Wittr., are not recorded in Collins 1 Green Alga3of North 

 America, and are therefore new finds for central California. The former 

 is also a new record for America. 



Diatomic Structure^ — A. A. C. Eliot Merlin writes on some new 

 diatomic structures discovered with a new Zeiss Apochromat. In Gras- 

 pedodiscus coscinodiscus the presence of secondaries is confirmed. The 

 shape of the primaries in Epithemiaturgida and Gy mbella gastroides Kiitz. 

 is described. The secondaries of Gomphonema geminatum Ag. are found 

 to resemble those of G. gastroides ; details of other species are also given. 

 The observations were made with working apertures varying between 

 1*8 and • 95 N.A. The author considers it probable that few, if any, 

 diatomic valves possessing medium-sized primary perforations have such 

 passages into the interior of the organism unobstructed or unprotected 

 by caps pierced by finer holes. The limit of this capping is at present 

 unknown, but probably species possessing very fine primaries, such as 

 Naviculaceae, do not require such protection. 



Algological Notes.]: — P. E. Kaiser continues his notes on Algee. The 

 first of the present contribution describes the finding of Enteromorpha 

 percursa J. Ag. in ditches of the saline marshes at Bad Elmen near 

 Magdeburg. The author discusses the formation of the thallus, which 

 may consist of as many as four cells in transverse section, arranged in 

 the form of a square. E. percursa (a common marine alga) has previously 

 been found inland in saline swamps near Teuditz (between Leipzig and 

 Magdeburg), and from the " Salzigen See " near Halle. The second note 

 records the presence of ITomazocladia germanica Richter on stones in the 

 Elbe above Schonebeck. The diatoms were enclosed in long gelatinous 

 sheaths 17-28/t broad, unbranched and brownish green. Richter has 

 recorded this species from Kotschau near Leipzig, aud stated that in 

 cultures it escaped from the sheath and lived free, thus showing that the 

 sheath was merely a protection for the frustules against the flowing water. 

 The water, both of the Elbe and that at Kotschau, is not quite devoid of 

 salt. In the third note the author records Fragilaria amphiceros Schiitt 

 from the Waginger See near Traunstein in Upper Bavaria. The form 

 approaches var. rhombica Grunow. It has till now only been found in 

 salt or brackish water. 



Deformation of Ascophyllum nodosum. § — L. Lutz describes a re- 

 markable deformation on the thallus of Ascophyllum nodosum, which 

 takes the form of an infundibuliform branch. The author explains this 

 growth on the theory that for some reason the normal development of 

 the terminal mother-cell has been arrested, and since this cell is always 

 at the base of a small depression in A. nodosum, a hollow has been formed 

 by the continued growth of the surrounding cells. The cause of the 

 arrested development in the mother-cell cannot so far be accounted for, 



* Torreya, xi. (1911) p. 17. 



t Journ. Quekett Micr. Club, ser. 2, xi. (1911) p. 199-202. 



% Hedwigia, 1. (1911) pp. 329-32. 



§ Bull. Soc. Bot. France, lvi. (1900) p. 60G. 



